Portable exercise device



FIG. 1 is a perspective view of the portable exercise device;

FIG. 2 is a top view of the portable exercise device;

FIG. 3 is a side view of the portable exercise device;

FIG. 4 is a bottom view of the portable exercise device;

FIG. 5 is a front view of the portable exercise device; and,

FIG. 6 is a back view of the portable exercise device.

The broken lines showing handle elements in FIG. 1 illustrates environmental portions of the portable exercise device and forms no part of the claimed design. 

The ornamental design for a portable exercise device, as shown and described. 